Ahmed Z. Sayed

Condensation of α-cyanocinnamonitriles with 6-bromo-2-naphthol: synthesis of pyrano (2,3-d)pyrimidine and pyrano(3,2-e) (1,2,4)triazolo(2,3-c)pyrimidine derivatives †

Naphthopyrans are synthesized by the reaction of cinnamonitriles with 6-bromo-2-naphthol; polysubstituted naph-thopyrimidines and naphthopyranotriazolopyrimidines are also prepared.

STUDIES ON THE SYNTHESIS OF SOME PYRAZOLO[1,5=a]PYRIMIDINES BEARING SULFONAMIDO MOIETIES

Abstract A novel synthesis of pyrazolo[1,5-a]pyrimidine derivatives 4,5 and 9 bearing sulfonamide moieties from the reaction of aminopyrazoles 1 with [bis(methy1sulfanyl)methylidene]malononitrile 2, [arylamino(methylsulfanyl)methylidene]malonoNtrile 6 and ethyl [bis(methylsulfanyl)methylidene]cyano acetate 7 is reported.

One-step synthesis of silver nanoparticles embedded with polyethylene glycol as thin films

Abstract Silver nanoparticles (Ag NPs) embedded and stabilized with polyethylene glycol (PEG) were synthesized as colloids by heating and exposure to sunlight (direct and indirect) irradiation as green method. The deposition of Ag NP-PEGs onto Si-wafers was also made using the electrospray ionization deposition technique. The generating of Ag NP-PEGs as colloids was examined by UV–visible spectroscopy (UV–Vis) and transmission electron microscopy (TEM). The chemical composition of the resulted nanocomposites was evaluated by Fourier transform infrared (FTIR) and that of thin-film surfaces by X-ray photoelectron spectroscopy. Structure–property relationships of Ag-PEG nanocomposites prepared by heating were discussed in dependence on the time of heating. The UV–visible results confirmed the successful synthesis of spherical Ag NPs with absorption peaks at a wavelength of λ = 413 nm for the heating method and at λ = 418 as well as 449 nm for direct and indirect exposure to the sunlight. Ag-PEG nanocomposite thin films showed excellent antimicrobial activity. These results revealed that the Ag-PEG nanocomposites thin films can be used as potential materials in biomedical applications.

Modeling and optimizing Acid Orange 142 degradation in aqueous solution by non-thermal plasma.

The effects of the high voltage electrode material, initial pH of the solution, initial concentration of Fe2+, and time of plasma treatment on the efficiency of Acid Orange 142 (AO142) degradation were studied and evaluated. Furthermore, based on the Box-Behnken response surface methodology (BBD-RSM), a model between response (decolorization efficiency %) and influencing factors was proposed to estimate the interactive effects and optimize the process conditions. The proposed model was adequate with an R2 of 0.8005 which is in reasonable agreement with the R2adj of 0.9307. According to the model, the optimum conditions were steel as a high voltage electrode, an initial pH 3.0, an initial Fe2+ concentration 0.9 mM, and 20 min time of treatment to obtain a decolorization efficiency of 95.05%. In addition, the analytical results of UV-Vis, FT-IR, TOC and GC-MS indicated the degradation of the dye molecule.